Just enough to solve your car affordability dashboard — anything you've already told another HowAffordable calculator is filled in for you.
Figures are for a U.S. household of 2.5 people (the Census Bureau's average household size) and come from the most current government and industry data available, mostly 2024–2025: the Bureau of Labor Statistics' Consumer Expenditure Survey (2024) for utilities, fuel, vehicle maintenance/repairs, groceries, car insurance, and going out; Child Care Aware of America's 2024 Price & Supply report for child care; and Reviews.org's State of Consumer Media Spending 2025 for cell/TV/internet/streaming. Car insurance is cross-checked against Insurify's 2026 national rate data.
Two of these numbers work differently. Most figures are averaged across all households, including ones that spend $0 in that category. Child care is different — its ~$1,094 average is taken only from families who actually pay for care, so it will overstate your real cost if you don't have paid child care (leave it at $0 if that's you). Car insurance can also run higher for full coverage — more recent trackers put that closer to $187/mo.
These are national estimates to help you get started, not your actual costs — replace any box with your real number whenever you know it.
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How this calculator works
A dealership's finance office will happily stretch a payment to 20% of your income across 84 months — that's how a $38,000 SUV becomes "only $540 a month." This calculator runs the math the other direction: it starts from your take-home pay, caps the payment at 10% of it, and solves for the vehicle price that payment actually buys at today's rates.
Pick new or used, a loan term (36 to 84 months — 60 for new and 48 for used by default), and a down payment. The calculator pulls the current average new-car (60-month) or used-car (48-month) loan rate from Bankrate's weekly survey via FRED, then finds the price where principal and interest on the amount financed equals 10% of your monthly take-home. Drag the payment or price slider and the other side re-solves instantly.
Six factors, weighted for a car rather than a house: Debt-to-Income 25%, Payment vs. Income 20%, Cash Cushion 20%, Emergency Fund 20%, Down Payment 10%, Controllable Bills 5%. Cash on hand counts for more here than on the home calculator because a car is the purchase most likely to coincide with a surprise repair bill.
| Factor | What it measures | Full marks | Failing |
|---|---|---|---|
| Debt-to-Income | All monthly debt payments, including the new car, ÷ take-home | ≤ 20% | > 50% |
| Payment vs. Income | The car payment alone ÷ take-home | ≤ 7% | > 20% |
| Down Payment | Down payment (plus trade-in) ÷ vehicle price | ≥ 20% | < 5% |
| Cash Cushion | What's left each month after the payment, debts and bills | ≥ 25% of income | < $800 |
| Controllable Bills | Phone, TV, internet and going-out spending ÷ income | ≤ 5% | > 18% |
| Emergency Fund | Savings ÷ total monthly obligations, in months | ≥ 6 months | < 2 weeks |
Notice the down-payment bands: 20% earns full marks even though the price solver doesn't require a down payment. That's on purpose. Twenty percent down is what keeps you from owing more than the car is worth in year two, so the report card coaches you toward it rather than forcing it.
It's the "10" in the 20/4/10 rule: 20% down, a loan no longer than 4 years, and total car costs (payment plus insurance and fuel) under 10% of income. This calculator applies the payment half of that rule and shows the term trade-off explicitly — a longer term lowers the payment and raises both the price you "qualify" for and the total interest you'll pay.
Because the payment is held at 10% of your income, stretching that same payment over 84 months instead of 48 finances a bigger loan. The report card doesn't reward that: the Down Payment and Cash Cushion factors don't change, and you'll pay far more interest. Use the term buttons to see the trade-off, then pick the shortest term the payment allows.
Its value is added to your down payment on the intake screen, which raises the Down Payment grade and lowers the amount financed. If you still owe on the trade, only the equity above the payoff counts — see the trade-in guide for when a private sale nets more.
The calculator pulls the current national average for each: 60-month new-car loans or 48-month used-car loans. Your actual APR depends on your credit tier and the lender; type your real quote into the rate field to see your numbers exactly.
They're not in the payment, but they're why the payment target is conservative. Car insurance and fuel are part of the expenses on the intake screen, so they lower your Cash Cushion honestly. Repairs are what the Emergency Fund factor is guarding.
Last reviewed September 2026. Read our methodology for every source and assumption, and the calculator disclaimers for what these estimates are and aren't.